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<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>函数接收参数并弹出</title>
    <style>
    body {
        font: 12px/1.5 Tahoma;
        text-align: center;
    }
    
    code,
    input,
    button {
        font-family: inherit;
    }
    
    input {
        border: 1px solid #ccc;
        padding: 3px;
    }
    
    button {
        cursor: pointer;
    }
    </style>
    <script>
    var myFn = function(a, b) {
        alert(a.value);
        alert(b.value)
    };
    window.onload = function() {
        var oInput = document.getElementsByTagName("input");
        var oBtn = document.getElementsByTagName("button")[0];
        oBtn.onclick = function() {
            myFn(oInput[0], oInput[1])
        }
    };
    </script>
</head>

<body>
    <p>
        <input type="text" value="北京市" />
    </p>
    <p>
        <input type="text" value="朝阳区" />
    </p>
    <p>
        <button>传参</button>
    </p>
</body>

</html>
